06154818 is referenced by 54 patents and cites 23 patents.

A system and method for controlling access to privilege partitioned address space for a model specific register file. A superscalar microprocessor includes a plurality of model specific registers (MSRs). MSRs differ between various implementations of a microprocessor architecture. The MSRs are allocated to access regions within a MSR file. Each access region of the MSR file is assigned access attributes. The MSRs are allocated such that the access region and the access attributes of the MSRs are defined by the address of the MSRs. Access to the MSRs is controlled by comparing the address of the MSR to the current privilege level of the microprocessor. In one embodiment, a validity check circuit is used to control access to the MSRs. If an access is attempted to a MSR that cannot be accessed at the current microprocessor privilege level, access to the register is denied and an exception is generated. In one embodiment, an address checker may be used to verify whether a MSR address is within a valid range. The MSR file may be divided into regions, with access granted based on a microprocessor being in a supervisory mode or a user mode.

Title
System and method of controlling access to privilege partitioned address space for a model specific register file
Application Number
8/975027
Publication Number
6154818
Application Date
November 20, 1997
Publication Date
November 28, 2000
Inventor
David S Christie
Austin
TX, US
Agent
Conley Rose & Tayon PC
Agent
Lawrence J Merkel
B Noel Kivlin
Assignee
Advanced Micro Devices
CA, US
IPC
G06F 13/00
G06F 12/14
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